Improvement in dies for crimping the halves of split spindles



Patented APH| 27, 1875 Iii/ 4 i 3 0 A m N WW w N. H 9

Dies for Crimping the Halves of Split Spindles.

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UNITED STATES PATENT OFFICE.

HENRY M. JOHNSON, OF LOWELL, MASS, ASSIGNOR TO EARL A. THISSELL,

CYRUS O. PIOKERING, AND EDWIN LAMSON, OF SAME PLACE.

IMPROVEMENT IN DIES FOR CRlMPlNG THE HALVES 0F SPLIT SPINDLESN Specification forming part of Letters Patent No. 162,661 dated April 27, i875; application filed January 7, 1874.

To all whom it may concern Be it known that I, HENRY M. JOHNSON, of Lowell, Middlesex county, Massachusetts, have invented Dies for Forming Spindles, of which the following is a specification:

My invention relates to an improvement in the manufacture of notched, serrated, or undulating split spindles; and consists in the employment of a central die in combination with two outer dies, in such a manner that the desired form may be given to both sides of the spindle at one operation, the object ofmy invention being to facilitate the manufacture of spindles of this class, and toproduce a stronger and lighter spindle than has heretofore been made.

Figure 1- is a longitudinal section through the spindle and dies embodyingmyinventiou. Fig. 2 is a cross-section of the same. Fig. 3 is a longitudinal section through dies and spindlcs, showing a different form of spindle, and also embodying my invention. Fig. 4 is a cross-section of same.

A A A A are dies acting on the outside of the spindle. B B are dies placed in the opening. 0 O are the forms of longitudinal and cross-sections of the two forms of spindles. The outer dies should be placed in a suitable press,and the central die placed in its proper relative position, allowing a slight movement toward either of the outer dies. The spindle may now he placed over the central die and the desired form be given it by bringing the outer dies to bear with pressure on the central die.

It is apparent that a spindle may be much more readily polished before any irregularity is given to its outline, and that it is desirable to impress these irregularities with as slight an injury to the surface as possible. In all former methods of producing the irregularities of outline the depressions have been produced by the use of a file, or by ham mering, giving a roughness of surface which must beremoved by a comparatively laborious process. The use of a file across the spindle for the purpose of forming the depressions weakens the spindle materially, while the'spindle formed by my improved dies may have a cross-section of nearly equal strength at every part of its length, and, while the spindle formed by the dies requires much less finishing after the stamping operation than that formed by blows from a hammer, it is also a much more expeditious method of shaping.

The faces of the outer dies, in cross-section, are straight, and do not conform to the crosssection of the spindle. This form of crosssection is especially convenient in operation, as the spindle need notbe placed so carefully on a particular line of the central die, and in consequence the operation may be more quickly performed, besides avoiding an objectionable offset on the edges of the split halves if the dies were made to conform, in cross-section, to the s1; indle-halves.

I claim The dies for crimping split spindles, consistin g of theloose centraldie provided With transverse ribs, and the two outer dies, having grooves or depressions corresponding to the ribs of the central die, substantially as dedescribed.

HENRY M. JOHNSON.

Witnesses:

NATHANIEL HILL, Farmers J EWETT. 

